Terrestrial environment

Assessing field vulnerability to phosphorus loss in Beijing agricultural areausing Revised Field Phosphorus Ranking Scheme

LI Qi , CHEN Li-ding , QI Xin , ZHANG Xin-yu , MA Yan , FU Bo-jie


Received October 22, 2006,Revised February 22, 2007, Accepted , Available online

Volume 19,2007,Pages 977-985

  • Summary
  • References
  • Related Articles
Guanting Reservoir, one of the drinking water supply sources of Beijing, su ers from water eutrophication. It is mainly supplied by Guishui River. Thus, to investigate the reasons of phosphorus (P) loss and improve the P management strategies in Guishui River watershed are important for the safety of drinking water in this region. In this study, a Revised Field P Ranking Scheme (PRS) was developed to reflect the field vulnerability of P loss at the field scale based on the Field PRS. In this new scheme, six factors are included, and each one was assigned a relative weight and a determination method. The a ecting factors were classified into transport factors and source factors, and, the standards of environmental quality on surface water and soil erosion classification and degradation of the China were used in this scheme. By the new scheme, thirty-four fields in the Guishui River were categorized as “low”, “medium” or “high” potential for P loss into the runo . The results showed that the P loss risks of orchard and vegetable fields were higher than that of corn and soybean fields. The source factors were the main factors to a ect P loss from the study area. In the study area, controlling P input and improving P usage e ciency are critical to decrease P loss. Based on the results, it was suggested that more attention should be paid on the fields of vegetable and orchard since they have extremely high usage rate of P and high soil test of P. Compared with P surplus by field measurements, the Revised Field PRS was more suitable for reflecting the characteristics of fields, and had higher potential capacity to identify critical source areas of P loss than PRS.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3